Nuget package files reappear after post build event

I have a nuget package which is like

<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd"><metadata><id>Nuget1</id><version>1.4.21</version><title></title><authors></authors><owners></owners><requireLicenseAcceptance>false</requireLicenseAcceptance><projectUrl></projectUrl><description></summary><language>en-US</language></metadata><files><file src="nuget.targets" target="build\nuget.targets" /><file src="..\.dll" target="lib\net472\.dll" /></files><Project>

Target file looks like

<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"><ItemGroup>    <None Include="$(MSBuildThisFileDirectory)\..\.dll"><Link>.dll</Link><CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory><PackagePath>lib</PackagePath></None></ItemGroup></Project>

This is used in project C# library Sample.csproj .I then add post build event to this since these files need to be moved to subfolder in bin .

move  "$(TargetDir).dll" "$(TargetDir)subfolder"

Problem is Even after I move the file shown in output. Its still there after build is completed. Not sure whats happening . its moved during build and files reappear once build is completed